Maritime Morse Coast Station Markers submitted by Radio Officer S.J. "Joe" Prewitt, W0TUT of Panama Beach City, Florida (Silent Key on August 23, 2017.) You will hear the high frequency - HF - markers used by coastal wireless Morse Code telegraphy stations world-wide. Stations all over the world were recorded. These signals were sent when the station was listening for calls from ships on the high frequency bands. When the coast station was occupied passing messages with other vessels, these signals were not sent, with the exception of RCA's Atlantic coast station, Chatham Radio/WCC which sent these signals continuously except when their operator was using the key to send with.